class_docstr: Dealing with Repeat.
  
  The depth choice should already have been handled in :class:`ParameterChoiceLeafMutator` and :class:`ParameterChoiceMutator`.
code: def __init__(self, nodes: List[Node]):
      # nodes is a subgraph consisting of repeated blocks.
      super().__init__(label=nodes[0].operation.parameters["label"])
      self.nodes = nodes
  
imports: from __future__ import annotations
  from typing import Any, List, Tuple, Dict, Iterable, cast
  from nni.mutable import MutableExpression, Categorical, frozen_context, label_scope
  from nni.nas.space import Graph, GraphModelSpace, Node, StationaryMutator, Mutator
  from nni.nas.space.graph_op import Cell
label_desc: Use image node_id 1 to create a new RepeatMutator object from inherited base classes: StationaryMutator with example: obj = RepeatMutator(nodes)